app_list: Fix shadow bleeds over launcher button and steals mouse events

ui/aura/test/test_window_delegate.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/aura/test/test_window_delegate.h"
 
 #include "ui/aura/event.h"
 #include "ui/aura/window.h"
 #include "ui/base/hit_test.h"
 #include "ui/gfx/canvas.h"
+#include "ui/gfx/path.h"
+#include "ui/gfx/skia_util.h"
 
 namespace aura {
 namespace test {
 
 ////////////////////////////////////////////////////////////////////////////////
 // TestWindowDelegate
 
 TestWindowDelegate::TestWindowDelegate() : window_component_(HTCLIENT) {
 }
 
@@ skipping 54 matching lines @@
 
 void TestWindowDelegate::OnWindowDestroying() {
 }
 
 void TestWindowDelegate::OnWindowDestroyed() {
 }
 
 void TestWindowDelegate::OnWindowVisibilityChanged(bool visible) {
 }
 
+bool TestWindowDelegate::HasHitTestMask() const {
+  return false;
+}
+
+void TestWindowDelegate::GetHitTestMask(gfx::Path* mask) const {
+}
 
 ////////////////////////////////////////////////////////////////////////////////
 // ColorTestWindowDelegate
 
 ColorTestWindowDelegate::ColorTestWindowDelegate(SkColor color)
     : color_(color),
       last_key_code_(ui::VKEY_UNKNOWN) {
 }
 ColorTestWindowDelegate::~ColorTestWindowDelegate() {
 }
 
 bool ColorTestWindowDelegate::OnKeyEvent(KeyEvent* event) {
   last_key_code_ = event->key_code();
   return true;
 }
 void ColorTestWindowDelegate::OnWindowDestroyed() {
   delete this;
 }
 void ColorTestWindowDelegate::OnPaint(gfx::Canvas* canvas) {
   canvas->DrawColor(color_, SkXfermode::kSrc_Mode);
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// MaskedWindowDelegate
+
+MaskedWindowDelegate::MaskedWindowDelegate(const gfx::Rect mask_rect)
+    : mask_rect_(mask_rect) {
+}
+
+bool MaskedWindowDelegate::HasHitTestMask() const {
+  return true;
+}
+
+void MaskedWindowDelegate::GetHitTestMask(gfx::Path* mask) const {
+  mask->addRect(RectToSkRect(mask_rect_));
+}
+
 }  // namespace test
 }  // namespace aura